Casting ordinary general relativity as a perturbative theory in Λ-1 and starting with background theory in which Λ → ∞ allows one to explicitly compute nondegenerate physical quantum states and observables. The technique is applicable in the theory in general and also in mini-super-space models. In the general theory, the calculations are well defined and tractable, but quite involved. This opens up a program for the quantization of the gravitational field that is well defined computationally and allows contact with the physical observables of the theory, a key ingredient in the road to finding a theory with a semiclassical regime that makes contact with ordinary low energy physics.
Publication Source (Journal or Book title)
Physical Review Letters
Gambini, R., & Pullin, J. (2000). Making classical and quantum canonical general relativity computable through a power series expansion in the inverse cosmological constant. Physical Review Letters, 85 (25), 5272-5275. https://doi.org/10.1103/PhysRevLett.85.5272